I see many people extolling the virtues of Bondo, including some who have patched up (cosmetically) the crappy Chinese castings on their lathes or mills. I want to do the same, but a quick visit to the Bondo web site reveals a zillion varieties, and even when narrowed down to body fillers there are still a heap of different types. Is there a preferred type? A particular reason for one vs the other. Etc, etc...
It'd be real nice if someone who has been through the cosmetic work on a lathe or mill could find the time to respond. But all suggestions will be welcomed, including the likes of "it's **really** good for ..." (fill in the blanks).
PS What do you do if you need to patch on really heavily oil-soaked metal - where it doesn't seem to matter how many times you solvent-wash it, oil just seems to keep coming out of the metal?